This is an excerpt to an article from Instructables on building your own battery powered usb charger, it is very detailed. In this post I will only cover the basic features and will provide you with the url at the end of the article.
The charger circuitry and 2 AA batteries fit into an Altoids gum tin, and will run your iPod for hours: 2.5x more than you’d get from a 9V USB charger! You can use rechargable batteries too.
This project is suitable for beginners, some soldering tools are necessary but even if you’ve never soldered before it should be pretty easy. Here is what you need to have, look at the pics:
As I said here are the basic items that you need to make this battery usb charger for your Blackberry. Any other Blackberry parts needs replacing please go to our big blue button on the top right. Here is the url (http://www.instructables.com/id/MintyBoost!—Small-battery-powered-USB-charger/?ALLSTEPS) for the full detailed explanation on making this battery usb charger. Though the article talks about charging an iPod, this works for a Blackberry cell phone as well.
